linux-kernel - Re: [PATCH V4] firmware: arm_scmi: Make scmi core independent of the transport type

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Date:   Thu, 23 Jan 2020 10:30:33 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     arnd@...db.de, jassisinghbrar@...il.com, cristian.marussi@....com,
        peng.fan@....com, peter.hilber@...nsynergy.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH V4] firmware: arm_scmi: Make scmi core independent of the
 transport type

On Wed, Jan 22, 2020 at 12:15:38PM +0000, Sudeep Holla wrote:
> On Wed, Jan 22, 2020 at 08:06:23AM +0530, Viresh Kumar wrote:
>

[...]

> > Can you please help me getting this tested, now that I have rebased it
> > as well :) ?
> >
>
> Sure, I will give it a go on my Juno. Thanks for the rebase, makes it
> simpler.
>

Sorry for the delay. I gave this a spin on my Juno. I am seeing below
warning once on boot but it continues and everything seem to work fine.
Also the warning is not related to this change I believe and this patch
is just helping to hit some corner case with deferred probe and devres.
I need to spend some time to debug it.

Regards,
Sudeep

--->8

WARNING: CPU: 1 PID: 187 at drivers/base/dd.c:519 really_probe+0x11c/0x418
Modules linked in:
CPU: 1 PID: 187 Comm: kworker/1:2 Not tainted 5.5.0-rc7-00026-gf7231cd3108d-dirty #20
Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Jan 16 2020
Workqueue: events deferred_probe_work_func
pstate: 80000005 (Nzcv daif -PAN -UAO)
pc : really_probe+0x11c/0x418
lr : really_probe+0x10c/0x418
Call trace:
 really_probe+0x11c/0x418
 driver_probe_device+0xe4/0x138
 __device_attach_driver+0x90/0x110
 bus_for_each_drv+0x80/0xd0
 __device_attach+0xdc/0x160
 device_initial_probe+0x18/0x20
 bus_probe_device+0x98/0xa0
 deferred_probe_work_func+0x90/0xe0
 process_one_work+0x1ec/0x4a8
 worker_thread+0x210/0x490
 kthread+0x110/0x118
 ret_from_fork+0x10/0x18
---[ end trace 06f96d55ce6093a8 ]---